729 lines
16 KiB
C
729 lines
16 KiB
C
/*-
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* Copyright (c) 2015 Dmitry Vagin <daemon.hammer@ya.ru>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/endian.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <net/bpf.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_vlan_var.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet/tcp.h>
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#include <netinet/udp.h>
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#include <machine/in_cksum.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/netgraph.h>
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#include <netgraph/ng_checksum.h>
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/* private data */
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struct ng_checksum_priv {
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hook_p in;
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hook_p out;
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uint8_t dlt; /* DLT_XXX from bpf.h */
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struct ng_checksum_config *conf;
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struct ng_checksum_stats stats;
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};
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typedef struct ng_checksum_priv *priv_p;
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/* Netgraph methods */
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static ng_constructor_t ng_checksum_constructor;
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static ng_rcvmsg_t ng_checksum_rcvmsg;
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static ng_shutdown_t ng_checksum_shutdown;
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static ng_newhook_t ng_checksum_newhook;
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static ng_rcvdata_t ng_checksum_rcvdata;
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static ng_disconnect_t ng_checksum_disconnect;
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#define ERROUT(x) { error = (x); goto done; }
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static const struct ng_parse_struct_field ng_checksum_config_type_fields[]
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= NG_CHECKSUM_CONFIG_TYPE;
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static const struct ng_parse_type ng_checksum_config_type = {
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&ng_parse_struct_type,
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&ng_checksum_config_type_fields
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};
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static const struct ng_parse_struct_field ng_checksum_stats_fields[]
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= NG_CHECKSUM_STATS_TYPE;
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static const struct ng_parse_type ng_checksum_stats_type = {
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&ng_parse_struct_type,
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&ng_checksum_stats_fields
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};
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static const struct ng_cmdlist ng_checksum_cmdlist[] = {
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_GETDLT,
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"getdlt",
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NULL,
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&ng_parse_uint8_type
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_SETDLT,
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"setdlt",
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&ng_parse_uint8_type,
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NULL
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_GETCONFIG,
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"getconfig",
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NULL,
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&ng_checksum_config_type
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_SETCONFIG,
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"setconfig",
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&ng_checksum_config_type,
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NULL
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_GET_STATS,
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"getstats",
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NULL,
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&ng_checksum_stats_type
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_CLR_STATS,
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"clrstats",
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NULL,
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NULL
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},
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{
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NGM_CHECKSUM_COOKIE,
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NGM_CHECKSUM_GETCLR_STATS,
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"getclrstats",
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NULL,
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&ng_checksum_stats_type
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},
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{ 0 }
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};
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static struct ng_type typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_CHECKSUM_NODE_TYPE,
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.constructor = ng_checksum_constructor,
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.rcvmsg = ng_checksum_rcvmsg,
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.shutdown = ng_checksum_shutdown,
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.newhook = ng_checksum_newhook,
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.rcvdata = ng_checksum_rcvdata,
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.disconnect = ng_checksum_disconnect,
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.cmdlist = ng_checksum_cmdlist,
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};
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NETGRAPH_INIT(checksum, &typestruct);
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static int
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ng_checksum_constructor(node_p node)
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{
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priv_p priv;
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priv = malloc(sizeof(*priv), M_NETGRAPH, M_WAITOK|M_ZERO);
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priv->dlt = DLT_RAW;
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NG_NODE_SET_PRIVATE(node, priv);
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return (0);
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}
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static int
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ng_checksum_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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if (strncmp(name, NG_CHECKSUM_HOOK_IN, strlen(NG_CHECKSUM_HOOK_IN)) == 0) {
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priv->in = hook;
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} else if (strncmp(name, NG_CHECKSUM_HOOK_OUT, strlen(NG_CHECKSUM_HOOK_OUT)) == 0) {
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priv->out = hook;
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} else
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return (EINVAL);
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return (0);
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}
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static int
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ng_checksum_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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struct ng_checksum_config *conf, *newconf;
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struct ng_mesg *msg;
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struct ng_mesg *resp = NULL;
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int error = 0;
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NGI_GET_MSG(item, msg);
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if (msg->header.typecookie != NGM_CHECKSUM_COOKIE)
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ERROUT(EINVAL);
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switch (msg->header.cmd)
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{
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case NGM_CHECKSUM_GETDLT:
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NG_MKRESPONSE(resp, msg, sizeof(uint8_t), M_WAITOK);
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if (resp == NULL)
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ERROUT(ENOMEM);
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*((uint8_t *) resp->data) = priv->dlt;
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break;
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case NGM_CHECKSUM_SETDLT:
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if (msg->header.arglen != sizeof(uint8_t))
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ERROUT(EINVAL);
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switch (*(uint8_t *) msg->data)
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{
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case DLT_EN10MB:
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case DLT_RAW:
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priv->dlt = *(uint8_t *) msg->data;
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break;
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default:
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ERROUT(EINVAL);
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}
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break;
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case NGM_CHECKSUM_GETCONFIG:
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if (priv->conf == NULL)
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ERROUT(0);
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NG_MKRESPONSE(resp, msg, sizeof(struct ng_checksum_config), M_WAITOK);
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if (resp == NULL)
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ERROUT(ENOMEM);
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bcopy(priv->conf, resp->data, sizeof(struct ng_checksum_config));
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break;
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case NGM_CHECKSUM_SETCONFIG:
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conf = (struct ng_checksum_config *) msg->data;
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if (msg->header.arglen != sizeof(struct ng_checksum_config))
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ERROUT(EINVAL);
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conf->csum_flags &= NG_CHECKSUM_CSUM_IPV4|NG_CHECKSUM_CSUM_IPV6;
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conf->csum_offload &= NG_CHECKSUM_CSUM_IPV4|NG_CHECKSUM_CSUM_IPV6;
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newconf = malloc(sizeof(struct ng_checksum_config), M_NETGRAPH, M_WAITOK|M_ZERO);
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bcopy(conf, newconf, sizeof(struct ng_checksum_config));
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if (priv->conf)
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free(priv->conf, M_NETGRAPH);
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priv->conf = newconf;
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break;
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case NGM_CHECKSUM_GET_STATS:
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case NGM_CHECKSUM_CLR_STATS:
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case NGM_CHECKSUM_GETCLR_STATS:
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if (msg->header.cmd != NGM_CHECKSUM_CLR_STATS) {
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NG_MKRESPONSE(resp, msg, sizeof(struct ng_checksum_stats), M_WAITOK);
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if (resp == NULL)
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ERROUT(ENOMEM);
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bcopy(&(priv->stats), resp->data, sizeof(struct ng_checksum_stats));
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}
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if (msg->header.cmd != NGM_CHECKSUM_GET_STATS)
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bzero(&(priv->stats), sizeof(struct ng_checksum_stats));
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break;
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default:
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ERROUT(EINVAL);
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}
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done:
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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#define PULLUP_CHECK(mbuf, length) do { \
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pullup_len += length; \
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if (((mbuf)->m_pkthdr.len < pullup_len) || \
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(pullup_len > MHLEN)) { \
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return (EINVAL); \
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} \
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if ((mbuf)->m_len < pullup_len && \
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(((mbuf) = m_pullup((mbuf), pullup_len)) == NULL)) { \
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return (ENOBUFS); \
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} \
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} while (0)
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#ifdef INET
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static int
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checksum_ipv4(priv_p priv, struct mbuf *m, int l3_offset)
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{
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struct ip *ip4;
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int pullup_len;
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int hlen, plen;
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int processed = 0;
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pullup_len = l3_offset;
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PULLUP_CHECK(m, sizeof(struct ip));
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ip4 = (struct ip *) mtodo(m, l3_offset);
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if (ip4->ip_v != IPVERSION)
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return (EOPNOTSUPP);
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hlen = ip4->ip_hl << 2;
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plen = ntohs(ip4->ip_len);
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if (hlen < sizeof(struct ip) || m->m_pkthdr.len < l3_offset + plen)
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return (EINVAL);
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if (m->m_pkthdr.csum_flags & CSUM_IP) {
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ip4->ip_sum = 0;
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if ((priv->conf->csum_offload & CSUM_IP) == 0) {
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if (hlen == sizeof(struct ip))
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ip4->ip_sum = in_cksum_hdr(ip4);
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else
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ip4->ip_sum = in_cksum_skip(m, l3_offset + hlen, l3_offset);
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m->m_pkthdr.csum_flags &= ~CSUM_IP;
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}
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processed = 1;
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}
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pullup_len = l3_offset + hlen;
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/* We can not calculate a checksum fragmented packets */
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if (ip4->ip_off & htons(IP_MF|IP_OFFMASK)) {
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m->m_pkthdr.csum_flags &= ~(CSUM_TCP|CSUM_UDP);
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return (0);
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}
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switch (ip4->ip_p)
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{
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case IPPROTO_TCP:
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if (m->m_pkthdr.csum_flags & CSUM_TCP) {
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struct tcphdr *th;
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PULLUP_CHECK(m, sizeof(struct tcphdr));
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th = (struct tcphdr *) mtodo(m, l3_offset + hlen);
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th->th_sum = in_pseudo(ip4->ip_src.s_addr,
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ip4->ip_dst.s_addr, htons(ip4->ip_p + plen - hlen));
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if ((priv->conf->csum_offload & CSUM_TCP) == 0) {
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th->th_sum = in_cksum_skip(m, l3_offset + plen, l3_offset + hlen);
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m->m_pkthdr.csum_flags &= ~CSUM_TCP;
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}
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processed = 1;
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}
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m->m_pkthdr.csum_flags &= ~CSUM_UDP;
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break;
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case IPPROTO_UDP:
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if (m->m_pkthdr.csum_flags & CSUM_UDP) {
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struct udphdr *uh;
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PULLUP_CHECK(m, sizeof(struct udphdr));
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uh = (struct udphdr *) mtodo(m, l3_offset + hlen);
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uh->uh_sum = in_pseudo(ip4->ip_src.s_addr,
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ip4->ip_dst.s_addr, htons(ip4->ip_p + plen - hlen));
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if ((priv->conf->csum_offload & CSUM_UDP) == 0) {
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uh->uh_sum = in_cksum_skip(m,
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l3_offset + plen, l3_offset + hlen);
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if (uh->uh_sum == 0)
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uh->uh_sum = 0xffff;
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m->m_pkthdr.csum_flags &= ~CSUM_UDP;
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}
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processed = 1;
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}
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m->m_pkthdr.csum_flags &= ~CSUM_TCP;
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break;
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default:
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m->m_pkthdr.csum_flags &= ~(CSUM_TCP|CSUM_UDP);
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break;
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}
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m->m_pkthdr.csum_flags &= ~NG_CHECKSUM_CSUM_IPV6;
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if (processed)
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priv->stats.processed++;
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return (0);
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}
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#endif /* INET */
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#ifdef INET6
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static int
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checksum_ipv6(priv_p priv, struct mbuf *m, int l3_offset)
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{
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struct ip6_hdr *ip6;
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struct ip6_ext *ip6e = NULL;
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int pullup_len;
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int hlen, plen;
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int nxt;
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int processed = 0;
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pullup_len = l3_offset;
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PULLUP_CHECK(m, sizeof(struct ip6_hdr));
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ip6 = (struct ip6_hdr *) mtodo(m, l3_offset);
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if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
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return (EOPNOTSUPP);
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hlen = sizeof(struct ip6_hdr);
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plen = ntohs(ip6->ip6_plen) + hlen;
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if (m->m_pkthdr.len < l3_offset + plen)
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return (EINVAL);
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nxt = ip6->ip6_nxt;
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for (;;) {
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switch (nxt)
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{
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case IPPROTO_DSTOPTS:
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case IPPROTO_HOPOPTS:
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case IPPROTO_ROUTING:
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PULLUP_CHECK(m, sizeof(struct ip6_ext));
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ip6e = (struct ip6_ext *) mtodo(m, l3_offset + hlen);
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nxt = ip6e->ip6e_nxt;
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hlen += (ip6e->ip6e_len + 1) << 3;
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pullup_len = l3_offset + hlen;
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break;
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case IPPROTO_AH:
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PULLUP_CHECK(m, sizeof(struct ip6_ext));
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ip6e = (struct ip6_ext *) mtodo(m, l3_offset + hlen);
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nxt = ip6e->ip6e_nxt;
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hlen += (ip6e->ip6e_len + 2) << 2;
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pullup_len = l3_offset + hlen;
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break;
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case IPPROTO_FRAGMENT:
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/* We can not calculate a checksum fragmented packets */
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m->m_pkthdr.csum_flags &= ~(CSUM_TCP_IPV6|CSUM_UDP_IPV6);
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return (0);
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default:
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goto loopend;
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}
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if (nxt == 0)
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return (EINVAL);
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}
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loopend:
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switch (nxt)
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{
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case IPPROTO_TCP:
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if (m->m_pkthdr.csum_flags & CSUM_TCP_IPV6) {
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struct tcphdr *th;
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PULLUP_CHECK(m, sizeof(struct tcphdr));
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th = (struct tcphdr *) mtodo(m, l3_offset + hlen);
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th->th_sum = in6_cksum_pseudo(ip6, plen - hlen, nxt, 0);
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if ((priv->conf->csum_offload & CSUM_TCP_IPV6) == 0) {
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th->th_sum = in_cksum_skip(m, l3_offset + plen, l3_offset + hlen);
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m->m_pkthdr.csum_flags &= ~CSUM_TCP_IPV6;
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}
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processed = 1;
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}
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m->m_pkthdr.csum_flags &= ~CSUM_UDP_IPV6;
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break;
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case IPPROTO_UDP:
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if (m->m_pkthdr.csum_flags & CSUM_UDP_IPV6) {
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struct udphdr *uh;
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PULLUP_CHECK(m, sizeof(struct udphdr));
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uh = (struct udphdr *) mtodo(m, l3_offset + hlen);
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uh->uh_sum = in6_cksum_pseudo(ip6, plen - hlen, nxt, 0);
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if ((priv->conf->csum_offload & CSUM_UDP_IPV6) == 0) {
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uh->uh_sum = in_cksum_skip(m,
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l3_offset + plen, l3_offset + hlen);
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if (uh->uh_sum == 0)
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uh->uh_sum = 0xffff;
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m->m_pkthdr.csum_flags &= ~CSUM_UDP_IPV6;
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}
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processed = 1;
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}
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m->m_pkthdr.csum_flags &= ~CSUM_TCP_IPV6;
|
|
break;
|
|
|
|
default:
|
|
m->m_pkthdr.csum_flags &= ~(CSUM_TCP_IPV6|CSUM_UDP_IPV6);
|
|
break;
|
|
}
|
|
|
|
m->m_pkthdr.csum_flags &= ~NG_CHECKSUM_CSUM_IPV4;
|
|
|
|
if (processed)
|
|
priv->stats.processed++;
|
|
|
|
return (0);
|
|
}
|
|
#endif /* INET6 */
|
|
|
|
#undef PULLUP_CHECK
|
|
|
|
static int
|
|
ng_checksum_rcvdata(hook_p hook, item_p item)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
struct mbuf *m;
|
|
hook_p out;
|
|
int error = 0;
|
|
|
|
priv->stats.received++;
|
|
|
|
NGI_GET_M(item, m);
|
|
|
|
#define PULLUP_CHECK(mbuf, length) do { \
|
|
pullup_len += length; \
|
|
if (((mbuf)->m_pkthdr.len < pullup_len) || \
|
|
(pullup_len > MHLEN)) { \
|
|
error = EINVAL; \
|
|
goto bypass; \
|
|
} \
|
|
if ((mbuf)->m_len < pullup_len && \
|
|
(((mbuf) = m_pullup((mbuf), pullup_len)) == NULL)) { \
|
|
error = ENOBUFS; \
|
|
goto drop; \
|
|
} \
|
|
} while (0)
|
|
|
|
if (!(priv->conf && hook == priv->in && m && (m->m_flags & M_PKTHDR)))
|
|
goto bypass;
|
|
|
|
m->m_pkthdr.csum_flags |= priv->conf->csum_flags;
|
|
|
|
if (m->m_pkthdr.csum_flags & (NG_CHECKSUM_CSUM_IPV4|NG_CHECKSUM_CSUM_IPV6))
|
|
{
|
|
struct ether_header *eh;
|
|
struct ng_checksum_vlan_header *vh;
|
|
int pullup_len = 0;
|
|
uint16_t etype;
|
|
|
|
m = m_unshare(m, M_NOWAIT);
|
|
|
|
if (m == NULL)
|
|
ERROUT(ENOMEM);
|
|
|
|
switch (priv->dlt)
|
|
{
|
|
case DLT_EN10MB:
|
|
PULLUP_CHECK(m, sizeof(struct ether_header));
|
|
eh = mtod(m, struct ether_header *);
|
|
etype = ntohs(eh->ether_type);
|
|
|
|
for (;;) { /* QinQ support */
|
|
switch (etype)
|
|
{
|
|
case 0x8100:
|
|
case 0x88A8:
|
|
case 0x9100:
|
|
PULLUP_CHECK(m, sizeof(struct ng_checksum_vlan_header));
|
|
vh = (struct ng_checksum_vlan_header *) mtodo(m,
|
|
pullup_len - sizeof(struct ng_checksum_vlan_header));
|
|
etype = ntohs(vh->etype);
|
|
break;
|
|
|
|
default:
|
|
goto loopend;
|
|
}
|
|
}
|
|
loopend:
|
|
#ifdef INET
|
|
if (etype == ETHERTYPE_IP &&
|
|
(m->m_pkthdr.csum_flags & NG_CHECKSUM_CSUM_IPV4)) {
|
|
error = checksum_ipv4(priv, m, pullup_len);
|
|
if (error == ENOBUFS)
|
|
goto drop;
|
|
} else
|
|
#endif
|
|
#ifdef INET6
|
|
if (etype == ETHERTYPE_IPV6 &&
|
|
(m->m_pkthdr.csum_flags & NG_CHECKSUM_CSUM_IPV6)) {
|
|
error = checksum_ipv6(priv, m, pullup_len);
|
|
if (error == ENOBUFS)
|
|
goto drop;
|
|
} else
|
|
#endif
|
|
{
|
|
m->m_pkthdr.csum_flags &=
|
|
~(NG_CHECKSUM_CSUM_IPV4|NG_CHECKSUM_CSUM_IPV6);
|
|
}
|
|
|
|
break;
|
|
|
|
case DLT_RAW:
|
|
#ifdef INET
|
|
if (m->m_pkthdr.csum_flags & NG_CHECKSUM_CSUM_IPV4)
|
|
{
|
|
error = checksum_ipv4(priv, m, pullup_len);
|
|
|
|
if (error == 0)
|
|
goto bypass;
|
|
else if (error == ENOBUFS)
|
|
goto drop;
|
|
}
|
|
#endif
|
|
#ifdef INET6
|
|
if (m->m_pkthdr.csum_flags & NG_CHECKSUM_CSUM_IPV6)
|
|
{
|
|
error = checksum_ipv6(priv, m, pullup_len);
|
|
|
|
if (error == 0)
|
|
goto bypass;
|
|
else if (error == ENOBUFS)
|
|
goto drop;
|
|
}
|
|
#endif
|
|
if (error)
|
|
m->m_pkthdr.csum_flags &=
|
|
~(NG_CHECKSUM_CSUM_IPV4|NG_CHECKSUM_CSUM_IPV6);
|
|
|
|
break;
|
|
|
|
default:
|
|
ERROUT(EINVAL);
|
|
}
|
|
}
|
|
|
|
#undef PULLUP_CHECK
|
|
|
|
bypass:
|
|
out = NULL;
|
|
|
|
if (hook == priv->in) {
|
|
/* return frames on 'in' hook if 'out' not connected */
|
|
out = priv->out ? priv->out : priv->in;
|
|
} else if (hook == priv->out && priv->in) {
|
|
/* pass frames on 'out' hook if 'in' connected */
|
|
out = priv->in;
|
|
}
|
|
|
|
if (out == NULL)
|
|
ERROUT(0);
|
|
|
|
NG_FWD_NEW_DATA(error, item, out, m);
|
|
|
|
return (error);
|
|
|
|
done:
|
|
drop:
|
|
NG_FREE_ITEM(item);
|
|
NG_FREE_M(m);
|
|
|
|
priv->stats.dropped++;
|
|
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
ng_checksum_shutdown(node_p node)
|
|
{
|
|
const priv_p priv = NG_NODE_PRIVATE(node);
|
|
|
|
NG_NODE_SET_PRIVATE(node, NULL);
|
|
NG_NODE_UNREF(node);
|
|
|
|
if (priv->conf)
|
|
free(priv->conf, M_NETGRAPH);
|
|
|
|
free(priv, M_NETGRAPH);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
ng_checksum_disconnect(hook_p hook)
|
|
{
|
|
priv_p priv;
|
|
|
|
priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
|
|
|
|
if (hook == priv->in)
|
|
priv->in = NULL;
|
|
|
|
if (hook == priv->out)
|
|
priv->out = NULL;
|
|
|
|
if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 &&
|
|
NG_NODE_IS_VALID(NG_HOOK_NODE(hook))) /* already shutting down? */
|
|
ng_rmnode_self(NG_HOOK_NODE(hook));
|
|
|
|
return (0);
|
|
}
|